One of the UK's most prolific sex offenders ever, David Carrick took advantage of his position as a serving officer to attack women for nearly 20 years.

When police arrive at a devastating car accident, they find a young woman with horrific head injuries. But her fiancé, officer Martin Forshaw, is barely hurt.

A police car executes a stop and search on a drugs courier, seizing hundreds of thousands of pounds - but serving officer Kashif Mahmood then lets the driver go.

When royal protection officer Michael Coulton's wife is found murdered just yards from her work, a few of his secrets begin to come to light.

Australian officers couldn't believe it when they intercepted a call to an international drugs cartel and heard their senior officer Mark Standen on the line.

An unknown blackmailer laces dog food with poison and baby food with glass, always able to stay one step ahead of police - until his true identity is revealed.

When sergeant Drew Peterson's wife Stacy goes missing, he claims she's left him for another man - but it's then discovered that his ex-wife also died mysteriously.

Adam Provan, a serving Metropolitan Police Office, lied about his age to take out 16-year-old Lauren Taylor on a date, then raped her in a local park and again in a playground. Lauren stayed silent for six years before coming forward.

PC Lewis Edwards was a young officer with a bright future ahead of him, but behind close doors, he was a dangerous and predatory pedophile, who used a fake Snapchat file.

Cliff Mitchell was a respected officer in west London but in private he was a violent sexual predator, intimidating his victim with his badge

Valerie Cincinelli: NYPD cop Valerie Cincinelli plots a murder, driven by jealousy and greed. The FBI uses her boyfriend undercover to gather evidence and expose her.

Adrian Trevor Moore was a respected officer. He was nominated for officer of the year, but behind closed doors he was a violent and sadistic sex offender.

When police officers are called to reports of an injured man crying in a car park, they’re shocked to discover he is actually a serving Dorset Police Officer.

A young woman is found unconscious in a Manchester hotel. Investigators discover her attacker is her ex and a serving police officer.